.flex{
    display: flex;
}
.flex-align-center{
    align-items: center;
}
.flex-btw{
    justify-content: space-between;
}
.flex-warp{
    flex-wrap: wrap;
}
.flex-center{
    display: flex;
    align-items: center;
    justify-content: center;
}
.flex-auto{
    flex: 1;
}
.flex-grow-auto{
    flex-grow: 1;
}